body {
    background-image: url(../imgs/main/main-bg.webp);
    background-repeat: no-repeat;
}

.logo {
    width: 35px;
    height: 40px;
    position: fixed;
    left: 42.3%;
    top: 2.5%;
    background-image: url(../imgs/logo.png);
    background-repeat: no-repeat;
    background-size: contain;
}

.welcome {
    width: 500px;
    height: 60px;
    font-family: SourceHanSansCN-ExtraLight;
    font-size: 28px;
    font-weight: lighter;
    letter-spacing: 4px;
    color: rgb(255, 255, 255, 0.7);
    position: fixed;
    left: 10%;
    top: 8%;
}

.intro1 p,
.intro2 p {
    font-family: SourceHanSansCN-ExtraLight;
    font-weight: 1;
}

.intro1 {
    color: rgb(255, 255, 255, 1);
    letter-spacing: 5px;
    font-size: 52px;
    line-height: 10px;
    margin: 0 auto;
    position: fixed;
    top: 50%;
    left: 10%;
    text-shadow: 1px 1px 60px white;
}

.intro2 {
    color: rgb(255, 255, 255, 0.7);
    font-size: 14px;
    letter-spacing: 2px;
    position: fixed;
    top: 71%;
    left: 10%;
    line-height: 0px;
}

.intro2 p {
    margin-top: 8px;
}

.main {
    flex: auto;
    flex-wrap: wrap;
    justify-content: space-around;
    position: fixed;
    top: 12.5%;
    left: 50%;
    width: 650px;
    height: 650px;
    /* background-color: blue; */
}

.main div {
    position: relative;
    width: 180px;
    height: 180px;
    margin: 25px 20px 20px 25px;
    border-radius: 35px;
    box-shadow: 8px 4px 24px 4px #CCCCCC;
    /* background-color: yellow; */
}

.main div p {
    font-family: SourceHanSansCN-ExtraLight;
    font-weight: 1;
    color: rgb(0, 0, 0, 0.7);
    font-size: 28px;
    position: relative;
    text-align: center;
    top: 42%;
    left: 52%;
    transform: translate(-50%, -50%);
    width: 100px;
    margin: 0;
    line-height: 16px;
    letter-spacing: 8px;
}

.main div:nth-child(1) {
    position: relative;
    border-radius: 35px 35px 10px 35px;
    display: inline-block;
    top: 15%;
    left: 15%;
}

.main div:nth-child(1) div {
    border-radius: 5px 5px 5px 5px;
    width: 0px;
    height: 0px;
    border-bottom: 25px solid #CCCCCC;
    border-left: 25px solid transparent;
    position: relative;
    top: 72px;
    left: 125px;
    box-shadow: none;
}

.main div:nth-child(2) {
    position: relative;
    border-radius: 35px 35px 35px 10px;
    display: inline-block;
    top: 15%;
    left: 10%;
}

.main div:nth-child(2) div {
    border-radius: 5px 5px 5px 5px;
    width: 0px;
    height: 0px;
    border-bottom: 25px solid #CCCCCC;
    border-right: 25px solid transparent;
    position: relative;
    top: 72px;
    left: -20px;
    box-shadow: none;
}

.main div:nth-child(3) {
    position: relative;
    border-radius: 35px 10px 35px 35px;
    display: inline-block;
    left: 15%;
    top: 11%;
}

.main div:nth-child(3) div {
    border-radius: 5px 5px 5px 5px;
    width: 0px;
    height: 0px;
    border-top: 25px solid #CCCCCC;
    border-left: 25px solid transparent;
    position: relative;
    top: -74px;
    left: 125px;
    box-shadow: none;
}

.main div:nth-child(4) {
    position: relative;
    border-radius: 10px 35px 35px 35px;
    display: inline-block;
    top: 11%;
    left: 10%;
}

.main div:nth-child(4) div {
    border-radius: 5px 5px 5px 5px;
    width: 0px;
    height: 0px;
    border-top: 25px solid #CCCCCC;
    border-right: 25px solid transparent;
    position: relative;
    top: -74px;
    left: -20px;
    box-shadow: none;
}